Metsue, Antoine
[UCL]
Bartosiewicz, Yann
[UCL]
Ejectors are passive devices that are used to suck and compress fluids. Their main advantage resides in the fact that they do not contain any moving parts, therefore limiting their required maintenance. They enable the use of low grade thermal energy sources, which makes their integration to refrigeration cycles especially compelling. The design process of such devices remains however particularly complex, and often requires expensive CFD or experimental investigation. So-called thermodynamic models are simple models that allow to swiftly predict ejector performance. Although such models are prominent in the literature, a general real gas model that could pre- dict ejector performance for any set of operating conditions is still lacking. In this thesis, a new real gas thermodynamic model is proposed. This model offers the possibility to evaluate ejector performance for on and off-design regimes, whether the flow is single-phase or two-phase, and taking friction losses into account. An emphasis has been set on the modeling of the choking phenomenology. In particular, the classical choking theory is compared to the compound-choking theory in the frame of ejector flows.
Bibliographic reference |
Metsue, Antoine. An improved thermodynamic model for supersonic ejectors. Ecole polytechnique de Louvain, Université catholique de Louvain, 2020. Prom. : Bartosiewicz, Yann. |
Permanent URL |
http://hdl.handle.net/2078.1/thesis:25302 |